Compaq ProLiant 1000 Performance of Microsoft Exchange Server 4.0 on Compaq Pr - Page 19

Effect of Increasing IS Buffers

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444A/0696 WHITE PAPER (cont.) 1...9 Score 4000 3500 3000 2500 2000 1500 1000 500 0 500 LoadSim Score vs. # Users # RAID 5 Drives in Store Volume (lower score is better) 7 drvs 3 drvs 1000 Number of Users 1500 Figure 8. Performance benefit of adding disks to an array. • Adding disk spindles to the RAID set produces a benefit in response time. • The benefit increases as the number of users increases. This is because the number of disk I/Os required increases also, so the benefit of the array controller becomes more apparent. System Memory System Memory plays a crucial role in the performance of Windows NT and NT applications. It is very important to have enough system memory in an Exchange Server computer. Effect of Increasing IS Buffers Aside from the amount of memory required for running Windows NT and Exchange Server, system memory and disk performance are interrelated. This is because the IS buffers are allocated from system memory. A small IS buffer will constrain disk I/O whereas a large IS buffer will tend to relieve the disk I/O requirements on the disk subsystem.

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LoadSim Score vs. # Users
# RAID 5 Drives in Store Volume
(lower score is better)
0
500
1000
1500
2000
2500
3000
3500
4000
500
1000
1500
Number of Users
Score
7 drvs
3 drvs
Figure 8. Performance benefit of adding disks to an array.
•
Adding disk spindles to the RAID set produces a benefit in response time.
•
The benefit increases as the number of users increases. This is because the number of disk
I/Os required increases also, so the benefit of the array controller becomes more apparent.
System Memory
System Memory plays a crucial role in the performance of Windows NT and NT applications. It is
very important to have enough system memory in an Exchange Server computer.
Effect of Increasing IS Buffers
Aside from the amount of memory required for running Windows NT and Exchange Server,
system memory and disk performance are interrelated. This is because the IS buffers are allocated
from system memory. A small IS buffer will constrain disk I/O whereas a large IS buffer will tend
to relieve the disk I/O requirements on the disk subsystem.